/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.dx.cf.code;

import com.android.dx.util.Hex;
import com.android.dx.util.LabeledList;

/**
 * List of {@link ByteBlock} instances.
 */
public final class ByteBlockList extends LabeledList {

	/**
	 * Constructs an instance.
	 * 
	 * @param size
	 *            {@code >= 0;} the number of elements to be in the list
	 */
	public ByteBlockList(int size) {
		super(size);
	}

	/**
	 * Gets the indicated element. It is an error to call this with the index
	 * for an element which was never set; if you do that, this will throw
	 * {@code NullPointerException}.
	 * 
	 * @param n
	 *            {@code >= 0, < size();} which element
	 * @return {@code non-null;} the indicated element
	 */
	public ByteBlock get(int n) {
		return (ByteBlock) get0(n);
	}

	/**
	 * Gets the block with the given label.
	 * 
	 * @param label
	 *            the label to look for
	 * @return {@code non-null;} the block with the given label
	 */
	public ByteBlock labelToBlock(int label) {
		int idx = indexOfLabel(label);

		if (idx < 0) {
			throw new IllegalArgumentException("no such label: "
					+ Hex.u2(label));
		}

		return get(idx);
	}

	/**
	 * Sets the element at the given index.
	 * 
	 * @param n
	 *            {@code >= 0, < size();} which element
	 * @param bb
	 *            {@code null-ok;} the value to store
	 */
	public void set(int n, ByteBlock bb) {
		super.set(n, bb);
	}
}
